JP6869653B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as sanitary napkins, pantyliners (pantyliners), disposable diapers and the like.

In absorbent articles such as sanitary napkins, the excretory liquid such as menstrual blood absorbed by the absorption layer evaporates from the skin facing surface side due to body temperature and is discharged as water vapor to the wearer's skin side. As a result of evaporation, the internal space of the absorbent article during wearing (between the wearer's skin and the skin facing surface of the absorbent article) becomes stuffy, which may cause skin troubles such as itching and rash. is there. Therefore, various absorbent articles have been proposed for the purpose of reducing and preventing skin troubles.

For example, Patent Document 1 describes a member arranged on the non-skin facing surface side of a surface layer forming a skin facing surface of an absorbent article, for example, a transfer sheet immediately below in contact with the surface layer, or a carrier wrapping the absorbing layer. It is described that a lotion is applied to a sheet or the like, and that a polysaccharide such as glycerin is blended as a lotion component. According to Patent Document 1, the lotion process is not applied to the surface material of the absorbent article, the gathered sheet, or the like that comes into direct contact with the wearer's skin, but is applied to the surface that does not come into direct contact with the wearer's skin. As a result, the lotion does not adhere to the skin from the time of wearing, and the lotion that has exuded during excretion of the liquid is said to reduce rash.

Further, Patent Document 2 describes a lotion coating that can be transferred to the wearer's skin by normal contact, wearer's movement, and body temperature on a part that comes into direct contact with the wearer's skin, such as the surface of a leg cuff of an absorbent article. It is also described that the lotion composition used for this lotion coating contains an emollient and an immobilizing agent for the emollient (such as glycerin monoester).

Further, in Patent Document 3, an intermediate layer containing glycerin is arranged between the surface layer and the absorbent layer as an absorbent article capable of suppressing transpiration of excrement liquid during wearing and effectively preventing stuffiness and skin troubles. Those having the above-mentioned configuration are described. A specific example of this intermediate layer is a fiber sheet in which glycerin is applied to a non-woven fabric, and the fiber sheet has a surface layer and an absorption layer in a region facing the excretory part (vaginal opening, etc.) of the wearer when worn. It is arranged between the core wrap sheet and the constituent core wrap sheet. According to Patent Document 3, the excrement liquid excreted from the wearer is mixed with glycerin in the intermediate layer, so that the evaporation of the excrement liquid to the skin side is suppressed and the absorption of the excrement liquid is promoted, and further. It is said that liquid return to the surface layer side is suppressed.

Japanese Unexamined Patent Publication No. 2004-89322 Japanese Unexamined Patent Publication No. 2001-314440 Japanese Unexamined Patent Publication No. 2015-104646

The techniques described in Patent Documents 1 and 2 are configured such that the lotion component is transferred to the wearer's skin while wearing the absorbent article in order to reduce skin troubles caused by stuffiness while wearing the absorbent article. Therefore, it is not a technique for suppressing stuffiness and evaporation of excrement liquid that cause skin troubles, as in the technique described in Patent Document 3. Although the technique described in Patent Document 3 has a certain effect on suppressing stuffiness and transpiration of excrement liquid while wearing an absorbent article, there is room for improvement. Further, in this type of absorbent article, an unpleasant odor caused by excrement absorbed in the absorption layer, particularly an unpleasant odor caused by menstrual blood or vaginal excrement, diffuses around the wearer during wearing. After disposing of the used absorbent article, there is a problem that it diffuses around the disposal site, but Patent Documents 1 to 3 do not describe a means capable of solving such a problem.

Therefore, an object of the present invention is to provide an absorbent article capable of suppressing evaporation of excrement liquid during wearing and effectively preventing stuffiness and skin troubles.

In the present invention, a liquid-permeable surface layer forming a skin-facing surface, a liquid-impermeable leak-proof layer forming a non-skin-facing surface, and an absorption layer intervening between both layers to absorb the wearer's excrement. The absorbent layer contains a vapor permeation inhibitor, and the vapor permeation inhibitor is an absorbent article containing an oil, an emulsifier, and a gelling agent.

According to the present invention, there is provided an absorbent article capable of suppressing evaporation of excrement liquid during wearing and effectively preventing stuffiness and skin troubles. Since the vapor permeation inhibitor having a function of suppressing the evaporation of the excrement liquid is contained in the absorption layer arranged at a position farther from the wearer's skin than the surface layer, the vapor permeation inhibitor is worn. The inconvenience of contacting a person's skin is unlikely to occur. Further, according to the absorbent article of the present invention, the action of the vapor permeation inhibitor can be expected to have an effect of preventing the inconvenience that the unpleasant odor derived from excrement absorbed in the absorption layer diffuses from the surface layer side to the outside.

FIG. 1 is a plan view showing a part of the skin-facing surface side (surface layer side) of the sanitary napkin according to the embodiment of the absorbent article of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 3 is an explanatory diagram of the action and effect of the vapor permeation inhibitor in the sanitary napkin shown in FIG.

Hereinafter, the absorbent article of the present invention will be described with reference to the drawings based on its preferred embodiment. 1 and 2 show a sanitary napkin, which is an embodiment of the absorbent article of the present invention. The napkin 1 of the present embodiment includes a surface sheet 2 as a liquid-permeable surface layer forming a skin-facing surface, a back surface sheet 3 as a liquid-impermeable leak-proof layer forming a non-skin-facing surface, and both layers. It is provided with an absorber 4 as an absorbing layer that is interposed between a few and absorbs excreted liquid such as menstrual blood excreted by the wearer.

In the present specification, the skin-facing surface is a surface of the absorbent article or a component thereof (for example, the absorber 4) that is directed toward the wearer's skin when the absorbent article is worn, that is, relatively on the wearer's skin. The near side, the "non-skin facing surface", is the surface of the absorbent article or its constituents that faces the side opposite to the skin side when the absorbent article is worn, that is, the side that is relatively far from the wearer's skin. Is. In addition, "when worn" here means a state in which the normal proper wearing position, that is, the correct wearing position of the absorbent article is maintained, and the absorbent article is in a state deviated from the wearing position. Does not include.

The napkin 1 includes an absorbent body 5 including a front surface sheet 2, a back surface sheet 3, and an absorber 4. As shown in FIG. 1, the napkin 1 or the absorbent body 5 has a vertical direction X extending from the ventral side of the wearer to the dorsal side via the crotch portion and a lateral direction Y orthogonal to the vertical direction X. The vertical direction X corresponds to the longitudinal direction of the napkin 1 or the absorbent body 5, and the horizontal direction Y corresponds to the width direction of the napkin 1 or the absorbent body 5. The front surface sheet 2 and the back surface sheet 3 each have a larger size than the absorber 4, and extend outward from the peripheral edge of the absorber 4, and at the extending portion thereof, an adhesive, a heat seal, and an ultrasonic seal are used. The peripheral seal portion 6 is formed by being bonded to each other by a known bonding means such as. The front surface sheet 2 and the back surface sheet 3 and the absorber 4 may be bonded by an adhesive.

The napkin 1 or the absorbent body 5 has a crotch part 1M arranged in the crotch part of the wearer at the time of wearing, a front part 1F arranged on the ventral side, that is, the front side of the wearer from the crotch part 1M, and the crotch part. The rear portion 1R arranged on the back side, that is, the rear side of the wearer with respect to 1M is provided in the vertical direction X. The inseam 1M has an excretion portion facing portion that is arranged to face the excretion portion (vaginal opening, etc.) in the wearer's crotch portion when the napkin 1 is worn, and the excretion portion facing portion is usually laterally Y in the inseam 1M. Located in the center of.

The absorber 4 includes an absorbent core 40 containing an absorbent material and a core wrap sheet 41 that covers the outer surface of the absorbent core 40, that is, the skin-facing surface and the non-skin-facing surface. The absorbent core 40 has a single-layer structure, has a substantially rectangular shape long in the vertical direction X in a plan view as shown in FIG. 1, and extends from the front portion 1F to the rear portion 1R. The core wrap sheet 41 is one continuous liquid permeable sheet having a width of 2 times or more and 3 times or less the length of the lateral Y of the absorbent core 40, and as shown in FIG. 2, the absorbent core is It covers the entire skin-facing surface of the 40 and extends outward in the lateral direction Y from both side edges along the vertical direction X of the absorbent core 40, and the extending portion is wound down below the absorbent core 40. It covers the entire non-skin facing surface of the absorbent core 40. The core wrap sheet does not have to be such a single sheet. For example, one skin-side core wrap sheet that covers the skin-facing surface of the absorbent core 40 and the skin-side core wrap sheet are Separately, it may be configured to include one non-skin side core wrap sheet that covers the non-skin facing surface of the absorbent core 40. The absorbent core 40 and the core wrap sheet 41 may be joined by a known joining means such as a hot melt type adhesive. The absorbent core 40 can be used without particular limitation as long as it is usually used for this kind of absorbent article. For example, a fiber aggregate such as wood pulp, a hydrophilized synthetic fiber, or the fiber. An aggregate in which a particulate water-absorbent polymer is retained can be used. As the core wrap sheet 41, for example, a liquid permeable sheet such as paper, various non-woven fabrics, and perforated films can be used.

The front surface sheet 2 and the back surface sheet 3 extend outward in the lateral direction Y from each of the side edges of the absorber 4 along the vertical direction X to form a side flap portion, and the side flap portion is peripheral at the inseam 1M. A pair of wing portions 7 and 7 extend outward in the lateral direction Y from the portions (front portion 1F and rear portion 1R), thereby extending the pair of wing portions 7 and 7 on both the left and right sides along the vertical direction X in the crotch lower portion 1M of the absorbent body 5. It is installed. The wing portion 7 is used by being folded back toward the non-skin facing surface side of the clothing when the napkin 1 is fixed to the crotch portion of the clothing such as shorts.

As shown in FIG. 2, a main body adhesive portion 8 for fixing the napkin 1 to clothes such as shorts is provided on the non-skin facing surface of the absorbent main body 5, that is, the non-skin facing surface of the back sheet 3. Further, on the non-skin facing surface of the wing portion 7, that is, the non-skin facing surface of the back sheet 3, a wing portion adhesive portion 9 for fixing the wing portion 7 to clothes such as shorts is provided. Both adhesive portions 8 and 9 are covered with a release sheet (not shown) when not in use.

One of the main features of the absorbent article of the present invention is that the absorbent layer contains a vapor permeation inhibitor. This vapor permeation inhibitor is an agent that exhibits a function of suppressing the permeation of vapor derived from the excrement liquid to the surface layer side (excretion liquid evaporation suppression function) by contact with excretion liquid such as menstrual blood and urine. Contains oil, emulsifier and gelling agent. In the napkin 1 of the present embodiment, as shown in FIG. 2, the vapor permeation inhibitor represented by reference numeral 10 is placed between the skin-facing surface (the surface on the surface sheet 2 side) of the absorbent core 40 and the core wrap sheet 41. Exists.

The steam permeation inhibitor according to the present invention is typically powdery under normal temperature and pressure before contact with the excretory liquid, and in this state, it does not have a function of suppressing evaporation of the excretion liquid, but menstrual blood and urine. When it comes into contact with the excretory liquid such as, it dissolves or disperses in the excretion liquid and exhibits the function of suppressing the evaporation of the excretion liquid, and the water in the excretion liquid evaporates and permeates to the surface layer side and the wearer's skin side. Can be suppressed. For example, while wearing the napkin 1, when excrement fluid such as menstrual blood is excreted from the wearer's excretion portion toward the excretion portion facing portion of the crotch portion 1M, that is, the central portion of the crotch portion 1M in the lateral direction Y, the excretory fluid is excreted. The excrement liquid sequentially permeates the surface sheet 2 and the core wrap sheet 41 in the thickness direction at the central portion of the napkin 1 in the lateral direction Y, reaches the skin-facing surface of the absorbent core 40, and reaches the skin-facing surface of the absorbent core 40 in the lateral direction. It is absorbed into the absorbent core 40 while being in contact with the steam permeation inhibitor 10 existing in the central portion of Y. FIG. 3 schematically shows a state in which the excrement liquid is absorbed in the central portion of the absorbent core 40 in the lateral direction Y, and the skin-facing surface of the excrement liquid absorbing portion 45 in the absorbent core 40. On the top, a liquid substance 11 in which the powdery vapor permeation inhibitor 10 is dissolved or dispersed in the excrement liquid is generated, and the liquid substance 11 permeates the vapor derived from the excrement liquid to the surface sheet 2 side. As a result of suppressing, stuffiness during wearing of the napkin 1 is suppressed, skin troubles (itching, rash, etc.) caused by stuffiness are effectively prevented, and a member such as the surface sheet 2 that comes into contact with the wearer's skin. Furthermore, the inconvenience that the unpleasant odor caused by the excrement liquid such as menstrual blood absorbed by the absorber 4 diffuses to the surface sheet 2 side is effectively prevented. Although the mechanism for suppressing the evaporation of the excrement liquid by the liquid substance 11 is not clear, the liquid substance 11 has a layer structure in which an oil film is formed on the excrement liquid, and this oil film does not physically prevent the evaporation of the excrement liquid. It is presumed that it plays a role of a moisture permeable barrier. The arrow in FIG. 3 indicates the permeation of the vapor derived from the excrement liquid, and the portion where the symbol × is superimposed on the arrow, that is, the portion where the liquid substance 11 exists, the permeation of the vapor is hindered. That is, it indicates that the vapor permeation is completely blocked, or that the vapor permeation is reduced as compared with that before the formation of the liquid material 11.

In the present embodiment, the back surface sheet 3 as the leak-proof layer has moisture permeability. Therefore, as shown by the arrow in FIG. 3, the vapor derived from the excrement liquid absorbed by the absorber 4 permeates the back surface sheet 3 in the thickness direction and is discharged to the outside of the napkin 1, so that the liquid substance 11 Even if the permeation of the vapor to the surface sheet 2 side is suppressed by this, it is difficult for moisture to accumulate inside the napkin 1, and stuffiness while wearing the napkin 1 and skin troubles caused by it are even more effective. Is prevented.

Here, "moisture permeability" is a property of water vapor diffusing from a high humidity side to a low humidity side according to the second law of thermodynamics, without accompanying airflow movement, as in the concept disclosed in JIS Z0208 and ASTM E398. , It is a property that is exhibited in a porous film having very small pores and a non-porous film having high compatibility with water. As the back sheet 3 (leakage-proof layer) having moisture permeability, for example, a moisture-permeable film alone, a laminate of a moisture-permeable film and a non-woven fabric, a water-repellent non-woven fabric, or the like can be used. From the viewpoint of quickly removing the moisture (humidity inside the napkin 1) accumulated inside the napkin 1, the back sheet 3 preferably has breathability in addition to moisture permeability. Here, "breathability" is a property that literally ventilates, and is typically a property that airflow passes through like various fabrics. The basis weight of the back sheet 3 is preferably 18 g / m ² or more, more preferably 35 g / m ² or more, and preferably 100 g / m ² or less, still more preferably 80 g / m ² or less.

By the way, in the absorber 4, the part where the liquid substance 11 which is a mixture of the excrement liquid and the vapor permeation inhibitor 10 is generated is the part where the powdery vapor permeation inhibitor 10 exists and the part where the excrement liquid is applied. In the napkin 1 shown in FIG. 3, the crotch portion 1M is the portion where the vapor permeation inhibitor 10 is present but the vapor permeation inhibitor 10 maintains the powdery form without contacting the excrement liquid. No liquid 11 is formed on both sides (parts other than the central portion) in the lateral direction Y, and therefore an oil film capable of suppressing evaporation of the excrement liquid is not formed. That is, the liquid substance 11 having an oil film capable of suppressing the evaporation of the excrement liquid is selectively generated only in the excretion liquid absorption portion 45 in the absorber 4, and the excretion liquid does not substantially exist, and the evaporation of the excretion liquid is a problem. It is not generated in the part that does not become. By pinpointing the liquid substance 11 at the required portion in this way, the moisture permeability or air permeability on the skin-facing surface side of the absorber 4 is not unnecessarily reduced and is limited to a necessary and sufficient range. Since it can be lowered, stuffiness during wearing of the napkin 1 and skin troubles caused by the stuffiness can be prevented more effectively.

In the absorbent article of the present invention, the vapor permeation inhibitor may be contained in the absorption layer, and as in the vapor permeation inhibitor 10 shown in FIG. 2, the skin-facing surface of the absorbent core 40 and the core wrap sheet 41 It may not be contained between the two, for example, it may be contained in the absorbent core 40, or the non-skin facing surface (the surface on the back surface sheet 3 side) of the absorbent core 40 and the core wrap sheet 41. It may be contained between. Even in the latter form, if the excrement liquid comes into contact with the vapor permeation inhibitor 10 at the non-skin facing surface position of the absorbent core 40 to generate the liquid substance 11, the oil film forming component of the excrement liquid is the excrement liquid. Since it has a lighter specific gravity than the water that occupies most of it, it can naturally migrate to the skin side of the wearer and form an oil film that can suppress the evaporation of excrement. Further, in any of the above embodiments including the present embodiment, since the core wrap sheet 41 is interposed between the surface sheet 2 and the vapor permeation inhibitor 10, the vapor permeation inhibitor 10 is on the surface sheet 2 side. Furthermore, there is an advantage that the inconvenience of jumping out to the wearer's skin side is unlikely to occur.

Further, in view of the expected effect, the vapor permeation inhibitor 10 is contained in at least the inseam 1M (the excretion portion facing portion) of the absorber 4 which is arranged to face the crotch portion of the wearer. It is preferable that the absorber 4 is uniformly contained in the entire surface in a plan view. The content or basis weight of the vapor permeation inhibitor 10 in the absorber 4 per unit area is preferably 8 g / m ² or more, more preferably 40 g / m ² or more, and preferably 160 g / m ² or less, further preferably 160 g / m 2 or less. Is 120 g / m ² or less.

In the absorbent article of the present invention, the content of the vapor permeation inhibitor is preferably 1% by mass or more, more preferably 5% by mass or more, and preferably 20% by mass or less with respect to the mass of the absorbent article. , More preferably 15% by mass or less. If the content of the vapor permeation inhibitor is too small, there is little point in using it, and if the content of the vapor permeation inhibitor is too large, the liquid permeability may deteriorate.

In the present embodiment, as shown in FIG. 2, the skin-facing surface side of the surface sheet 2 as the surface layer has an uneven shape. The present invention also includes a form in which the skin-facing surface side of the surface sheet 2 is a flat surface that does not have an uneven shape, but the surface sheet 2 itself that has a skin-facing surface side that has an uneven shape has an effect of suppressing evaporation of excrement. Therefore, in combination with the above-mentioned effect of suppressing the evaporation of excrement liquid by the vapor permeation inhibitor 10, the stuffiness during wearing of the napkin 1 is suppressed more effectively, and the skin trouble caused by this is further effective. It can be expected to be prevented. Further, since the skin-facing surface side of the surface sheet 2 has an uneven shape, the skin of the wearer of the napkin 1 and the surface sheet 2 are compared with each other as compared with the case where the skin-facing surface side of the surface sheet 2 is a flat surface. Since the contact area is reduced, the dry feeling of the skin-facing surface of the surface sheet 2 is improved. Further, when the inside of each convex portion constituting the uneven shape of the surface sheet 2 is filled with the constituent fibers, the excrement liquid is evaporated by the surface sheet 2 itself as compared with the case where the convex portion is hollow. This is preferable because the suppressing effect is more reliably achieved.

The uneven shape of the surface sheet 2 can be formed by embossing such as thermal embossing and ultrasonic embossing, and in each recess, that is, the embossed portion, which constitutes the formed uneven shape. , The constituent fibers of the surface sheet 2 are bonded by heat and / or pressure, and the density is higher than that of each convex portion which is not embossed. That is, the surface sheet 2 having a concave-convex shape on the side facing the skin has a coarse-dense structure of fibers composed of concave portions having a relatively high fiber density and convex portions having a relatively low fiber density. Since the coarse fiber structure itself has the effect of suppressing the transpiration of the excrement liquid, the stuffiness during wearing of the napkin 1 is even more effective in combination with the above-mentioned effect of suppressing the transpiration of the excrement liquid by the steam permeation inhibitor 10. It is expected that it will be suppressed and skin troubles caused by this will be prevented even more effectively.

As the surface sheet 2 (surface layer), a liquid-permeable surface sheet conventionally used in this type of absorbent article can be used. For example, a non-woven fabric, an air-through non-woven fabric, or a spunbonded non-woven fabric manufactured by the card method can be used. , Melt blown non-woven fabric, spun lace non-woven fabric, needle punch non-woven fabric, and other non-woven fabrics; films made liquid permeable by opening means and the like can be mentioned. These non-woven fabrics and films may be hydrophilized with a hydrophilic agent such as a surfactant. The basis weight of the surface sheet 2 is preferably 20 g / m ² or more, more preferably 35 g / m ² or more, and preferably 100 g / m ² or less, still more preferably 80 g / m ² or less.

Hereinafter, the vapor permeation inhibitor according to the present invention will be described. As described above, the vapor permeation inhibitor according to the present invention can be said to be an oil film forming agent that dissolves or disperses in excrement liquid such as menstrual blood and urine to form an oil film on the excretion liquid, and can be said to be an oil component, an emulsifier and It contains a gelling agent and is typically in the form of a powder under normal temperature and pressure. As the vapor permeation inhibitor according to the present invention, a powdery one under normal temperature and pressure is preferable because it does not easily adhere to the skin and is not sticky.

Examples of the oil contained in the steam permeation inhibitor include edible oils such as rapeseed oil, corn oil, cottonseed oil, olive oil and sesame oil; and polyhydric alcohols such as glycerin, and one of these may be used alone or in combination of two or more. Can be used in combination. The vapor permeation inhibitor is mainly composed of such cooking oil and polyhydric alcohol, and is highly safe for the human body.

The oil content of the vapor permeation inhibitor is preferably 50% by mass or more, more preferably 70% by mass or more, and preferably 95% by mass or less, still more preferably 90% by mass or less, based on the vapor permeation inhibitor. Is. If the oil content of the vapor permeation inhibitor is too low, the effect of suppressing the permeation of the vapor derived from the excrement liquid to the surface sheet side may decrease, and conversely, if the oil content is too high, it is a relatively emulsifier. And the content of the gelling agent is low, which is not preferable.

As the emulsifier contained in the vapor permeation inhibitor, an O / W type emulsion having an HLB (hydrophilic-lipophilic balance) of 8 or more and 13 or less is preferable. By using this specific O / W type emulsion as an emulsifier, it becomes easy to obtain a powdery vapor permeation inhibitor under normal temperature and pressure. Examples of the emulsifier of this specific O / W type emulsion include glycerin fatty acid ester, sorbitan fatty acid ester, sucrose fatty acid ester, propylene glycol fatty acid ester, soybean phospholipid, and the like, and one of them alone or 2 A combination of seeds and above can be used.

The content of the emulsifier in the vapor permeation inhibitor is preferably 0.5% by mass or more, more preferably 1% by mass or more, and preferably 5% by mass or less, still more preferably 3% by mass, based on the vapor permeation inhibitor. % Or less. If the content of the emulsifier in the vapor permeation inhibitor is too high or too low, it may be difficult to obtain a powdery vapor permeation inhibitor under normal temperature and pressure.
From the same viewpoint, the content of the emulsifier in the vapor permeation inhibitor is preferably 0.5% by mass or more, more preferably 1% by mass or more, and preferably 10 with respect to the oil content in the vapor permeation inhibitor. It is mass% or less, more preferably 5 mass% or less.

As the gelling agent contained in the vapor permeation inhibitor, one having a property of being soluble in water at an atmospheric temperature of 40 ° C. or lower is preferable. Here, the "property of being soluble in water at an atmospheric temperature of 40 ° C. or lower" means that the solubility in water at 40 ° C. is 0.5 g or more, and when such a solubility is 1 g or more, stuffiness or the like is further increased. It is preferable because it can be further prevented. The atmospheric temperature of 40 ° C. is a temperature close to the atmospheric temperature of the internal space of the absorbent article during wearing (between the skin of the wearer and the surface of the absorbent article facing the skin) or the body temperature of the wearer. Since the gelling agent shows solubility in water in such an atmosphere of body temperature, it quickly dissolves or disperses in the excrement liquid when it comes into contact with excrement liquid such as menstrual blood and urine when wearing an absorbent article. You will get it. Examples of the gelling agent having such properties include agar, gelatin, carrageenan, pectin and the like, and one of these can be used alone or in combination of two or more.

The content of the gelling agent in the vapor permeation inhibitor is preferably 5% by mass or more, more preferably 7% by mass or more, and preferably 20% by mass or less, still more preferably 15% by mass, based on the vapor permeation inhibitor. % Or less. If the content of the gelling agent in the vapor permeation inhibitor is too high or too low, it may be difficult to obtain a powdery vapor permeation inhibitor under normal temperature and pressure.
From the same viewpoint, the content of the gelling agent in the vapor permeation inhibitor is preferably 5% by mass or more, more preferably 7% by mass or more, and preferably 20% by mass, based on the oil content in the vapor permeation inhibitor. It is mass% or less, more preferably 15 mass% or less.

The vapor permeation inhibitor in powder form under normal temperature and pressure is obtained by drying a liquid mixture of an oil component, an emulsifier and a gelling agent into a solid powder. More specifically, for example, water and a gelling agent are mixed, and the mixture is stirred while heating under the condition that the temperature of the mixture becomes about 80 ° C., and the gelling agent in the mixture of water and the gelling agent. The concentration of is usually about 1 to 5% by mass. An emulsifier and an oil component are added to the stirring mixture in this order, and the mixture is further stirred to obtain an oil droplet (O / W) type liquid mixture in water having water as a continuous phase. Then, this liquid mixture is subjected to a known drying method such as freeze-drying or spray-drying, and the solid matter after drying is pulverized as necessary to obtain a desired powdery vapor permeation inhibitor (oil film forming agent). ) Is obtained. The concentration of the oil content in the mixture is about 10% by mass, and the concentration of the emulsifier in the mixture is about 0.2% by mass with respect to the gelling agent in the mixture of water and the gelling agent. Oil, an emulsifier, and a gelling agent are present in each of the powder particles in the powdered vapor permeation inhibitor thus obtained in this order from the inside.

Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above embodiment. For example, in the napkin 1, a liquid permeable sheet, which is also called a second sheet or a sublayer sheet, may be interposed between the surface sheet 2 and the absorber 4 (core wrap sheet 41). In addition to sanitary napkins, the absorbent articles of the present invention include pantyliners, incontinence pads, disposable diapers, and other articles that can be used to absorb excrement such as menstrual blood and urine. ..

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to such Examples.

(Manufacturing of vapor permeation inhibitor A)
89 parts by mass of ion-exchanged water and 1 part by mass of agar as a gelling agent are put into a homomixer and mixed, and the mixture is stirred while heating under the condition that the temperature of the mixture becomes 80 ° C. After adding 0.2 parts by mass of HLB9 glycerin fatty acid ester (manufactured by Taiyo Kagaku Co., Ltd., trade name "Sunsoft No. 641D") as an emulsifier and 10 parts by mass of rapeseed oil as an oil to the mixture of the above in this order. The mixture was stirred at a rotation speed of 8000 rpm for 5 minutes while heating so that the temperature of the mixture was maintained at 80 ° C. The O / W type liquid mixture thus obtained was freeze-dried to produce a powdery vapor permeation inhibitor A.

(Manufacturing of vapor permeation inhibitor B)
The above (steam permeation suppression) except that the amount of oil, emulsifier and gelling agent used was changed and HLB13 glycerin fatty acid ester (manufactured by Taiyo Kagaku Co., Ltd., trade name "Sunsoft A-181E") was used as the emulsifier. The steam permeation inhibitor B was produced in the same manner as in the production of the agent A).

[Test Examples 1 and 2: Evaluation test of vapor permeation inhibitor]
Room temperature 23 ° C., 50% R. H. In this environment, 1 g of the vapor permeation inhibitor to be evaluated was added to the petri dish containing 10 g of horse blood plasma, and the total weight of the petri dish was measured every hour immediately after the agent was added, and the total weight before the agent was added. The amount of plasma loss was calculated based on the weight. When plasma is gradually transpired in the above environment, if the vapor permeation inhibitor to be evaluated has an evaporation suppressing function, plasma evaporation is suppressed, so that the amount of plasma reduction is small. As a control example, a petri dish containing only 10 g of horse blood plasma without adding a vapor permeation inhibitor was prepared, and the amount of plasma reduction was also measured for the control. The results are shown in Table 1 below.

As shown in Table 1, since the amount of plasma decreased in Test Examples 1 and 2 was smaller than that in the control example, the vapor permeation inhibitors A and B had a transpiration inhibitory function (oil film forming ability). it is obvious. Therefore, since the absorbent layer of the absorbent article contains a vapor permeation inhibitor having such an evaporation suppressing function, the evaporation of excrement liquid is suppressed while the absorbent article is worn, causing stuffiness and skin troubles. It can be understood that it can be effectively prevented.

1 Sanitary napkin (absorbent article)
2 Surface sheet (surface layer)
3 Back sheet (leakage-proof layer)
4 Absorber (absorbent layer)
40 Absorbent core 41 Core wrap sheet 45 Excretion absorber 5 Absorbent body 10 Vapor permeation inhibitor 11 Liquid substance of vapor permeation inhibitor

Claims (6)

Absorption provided with a liquid-permeable surface layer forming a skin-facing surface, a liquid-impermeable leak-proof layer forming a non-skin-facing surface, and an absorption layer interposed between the two layers to absorb the wearer's excrement. It ’s a sex item,
The absorbent layer is composed of an absorbent core containing an absorbent material and a core wrap sheet covering the skin-facing surface of the absorbent core, and also contains a vapor permeation inhibitor.
The vapor permeation inhibitor is contained in an oil, an emulsifier and a gelling agent, and is located in a portion of the absorbent core facing the skin and facing the core wrap sheet so as to face the wearer's crotch. intake Osamusei goods it is. The absorbable article according to claim 1, wherein the emulsifier is an O / W type emulsion having an HLB of 8 or more and 13 or less. The absorbent article according to claim 1 or 2, wherein the gelling agent has a property of being soluble in water at an atmospheric temperature of 40 ° C. or lower. The vapor permeation inhibitor contains 0.5% by mass or more and 10% by mass or less of the emulsifier and 5% by mass or more and 20% by mass or less of the gelling agent with respect to the oil content in the vapor permeation inhibitor. Item 2. The absorbent article according to any one of Items 1 to 3. The absorbent article according to any one of claims 1 to 4, wherein the content of the vapor permeation inhibitor is 1% by mass or more and 20% by mass or less with respect to the mass of the absorbent article. The absorbent article according to any one of claims 1 to 5, wherein the leak-proof layer has moisture permeability.

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